When you try Indians.com, you arrive at the home page of the Cleveland Indians.
When you try Cavs.com, you arrive at the home page of the Cleveland Cavaliers.
When you try Browns.com, you get nothing. In fact, the site is registered to a registrant in Italy, according to Elliot's Blog, a site that does research on domain name investing. Per the site via case details, the team filed a UDRP for the Browns.com address. Currently, the Browns' home page can only be accessed by visiting ClevelandBrowns.com. I'm not sure how long these cases take for a decision to be made, but if Browns.com points to the team website in the near future, you'll know why.